US3619730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-speed, single-phase electric motor
Assignee: NAT RES DEV
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Filing: 1969-09-24
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Granted: 1971-11-09
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Expires: 1989-09-24
Abstract
Abstract A two-speed, single-phase, alternating current motor having a concentric wound stator winding comprising a main energizing winding and an auxiliary starting winding, the main winding (or both windings) being tapped and arranged for reconnection at one speed to provide current reversal in selected winding parts, thus providing pole-changing by the known method of pole-amplitude modulation.
Inventors
- 👤 Alexander R W Broadway
- 👤 William Fong
- 👤 Gordon H Rawcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:59
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/04; H02K17/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
In a two-speed, single-phase, alternating current motor, an arrangement comprising a wound stator comprising a main winding, and an auxiliary winding for providing starting torque, said main winding comprising first and second parts; and means for connecting said first and second parts together in first and second ways corresponding to the two motor speeds, one of said ways providing reversed current flow in one of said first and second main winding parts; each of said first and second main winding parts comprising coils having a graded number of turns increasing from the coils of greater pitch to the coils of lesser pitch.
Claim 2
Dependent Claim
102 words
In a two-speed, single-phase, alternating current motor, an arrangement comprising a wound stator comprising a main winding, and an auxiliary winding for providing starting torque, said main winding comprising first and second parts; and means for connecting said first and second parts together in first and second ways corresponding to the two motor speeds, one of said ways providing reversed current flow in one of said first and second main winding parts; each of said first and second main winding parts comprising coils having a graded number of turns increasing from the coils of greater pitch to the coils of lesser pitch.
Claim 3
Dependent Claim
53 words
In a two-speed, single-phase, alternating motor, a wound stator as claimed in claim 1, wherein each of said first and second main winding parts itself comprises first and second winding parts of concentric coils having a graded number of turns increasing from the coils of greater pitch to the coils of lesser pitch.
Claim 4
Dependent Claim
32 words
In a two-speed, single-phase, alternating current motor, a wound stator as claimed in claim 1 wherein the windings of said auxiliary winding provide alternative pole numbers corresponding to the two running speeds.
Claim 5
Dependent Claim
33 words
In a two-speed, single-phase, alternating current motor, a wound stator as claimed in claim 1, wherein said auxiliary winding provides a single pole number corresponding to the lower of the two running speeds.
Claim 6
Dependent Claim
31 words
In a two-speed, single-phase, alternating current motor, a wound stator as claimed in claim 1, wherein each of said first and second main winding parts is spread over 180 electrical degrees.
Claim 7
Dependent Claim
37 words
In a two-speed, single-phase, alternating current motor, a wound stator as claimed in claim 1, wherein said auxiliary winding occupies one-half to two-thirds as much of the stator winding space as is occupied by the main winding.
Claim 8
Dependent Claim
74 words
In a two-speed, single-phase, alternating current motor, a wound stator as claimed in claim 1, wherein each of said first and second main winding parts itself comprises first and second winding parts of concentric coils having a graded number of turns increasing from the coils of greater pitch to the coils of lesser pitch so that the main winding comprises first phase and second phase portions arranged in space quadrature in both running speeds.
Claim 9
Dependent Claim
89 words
In a two-speed, single-phase, alternating current motor, an arrangement comprising a wound stator comprising a main winding, and an auxiliary winding for providing starting torque, said main winding comprising first and second parts; and means for connecting said first and second parts together in first and second ways corresponding to the two motor speeds, one of said ways providing reversed current flow in one of said first and second main winding parts; each of said first and second main winding parts comprising coils having a graded number of turns.
Claim 10
Dependent Claim
89 words
In a two-speed, single-phase, alternating current motor, an arrangement comprising a wound stator comprising a main winding, and an auxiliary winding for providing starting torque, said main winding comprising first and second parts; and means for connecting said first and second parts together in first and second ways corresponding to the two motor speeds, one of said ways providing reversed current flow in one of said first and second main winding parts; each of said first and second main winding parts comprising coils having a graded number of turns.
Claim 11
Dependent Claim
31 words
In a two-speed, single-phase, alternating motor, a wound stator as claimed in claim 8 wherein the auxiliary winding provides a single pole number corresponding to one of the two running speeds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |